shellinabox: new package

shellinabox: new package

Shell In A Box implements a web server that can export arbitrary command
line tools to a web based terminal emulator. This emulator is accessible
to any JavaScript and CSS enabled web browser and does not require any
additional browser plugins.

Signed-off-by: Olivier Singla <olivier.singla@gmail.com>
[Thomas:
 - Use "select" instead of "depends on" for the OpenSSL dependency, and
   use alphabetic ordering.
 - Rewrap Config.in help text.
 - Use github macro
 - Explain why the OpenSSL dependency is mandatory, while
   --enable-ssl/--disable-ssl are available.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>